MIKE ISAAC and NATASHA SINGER

FEW big technology companies have dared to create online products for boys and girls aged 13 and younger. But, on Monday, Facebook introduced an app, called Messenger Kids, targeted at that age group and asks parents to give their approval so children can message, add filters and doodle on photos they send to one another. It is a bet that the app can introduce a new generation of users to the Silicon Valley giant’s ever-expanding social media universe.